34/8-14 S
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General information
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Wellbore history
GeneralWell 34/8-14 S with geological sidetracks A, B, C, and D were drilled on the Pan/Pandora prospect on the structural trend between the Visund and the Gimle Fields in the northern North Sea. The western part of the structure, the Pan structure, is defined by rotated fault blocks while the eastern part, the Pandora structure, consists of slided degradational blocks. The general objective of all the wells was to test the hydrocarbon potential in the structure. Wells 34/8-14 S (Pan) and 34/8-14 A (Pandora) were drilled to provide important information on the hydrocarbon phases and HC/water contacts. Both wells both proved hydrocarbons and sidetracks B, C, and D were subsequently drilled to further delineate hydrocarbon contacts and reserves.Operations and resultsWildcat well 34/8-14 S was spudded with the semi-submersible installation Borgland Dolphin on 17 September 2008 and drilled to TD at 3470 m (3133 m TVD) in the Early Jurassic Drake Formation. Angle was built slowly up to ca 10 deg deviation at 1268 m, then a steeper angle was built up to a maximum of 42 deg at 2268 m. The well was drilled with Seawater and hi-vis sweeps down to 1268 m, with KCl polymer with GEM GP from 1268 m to 1271 m, and with XP07 OBM from 1271 m to TD.Top Brent Group in well 34/8-14 S was encountered at 3187 m (2865 m TVD RKB) and proved to be oil and gas bearing. The quality of the reservoir sandstones of the Tarbert Formation was excellent. A GOC was found at 3226 m (2902 m TVD RKB). Oil was found down-to the Ness shales at 3247 m (2922 m TVD RKB. Above top Brent Group no oil shows are reported and gas levels were low.Two cores were cut from 3194 to 3250.5 m in well 34/8-14 S. The MDT was run for pressure points and fluid samples. Samples were obtained at 3199 m (gas), 3229 m (oil), and 3299 m (water).The well was plugged back and permanently abandoned on 21 October 2008 as an oil and gas discovery.TestingNo drill stem test was performed. -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13194.03221.0[m ]23221.03248.8[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]54.8Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory2210.0[m]DCBIOSTRAT2230.0[m]DCBIOSTR2250.0[m]DCBIOSTR2270.0[m]DCBIOSTR2290.0[m]DCBIOSTR2310.0[m]DCBIOSTR2330.0[m]DCBIOSTR2350.0[m]DCBIOSTR2370.0[m]DCBIOSTR2390.0[m]DCBIOSTR2410.0[m]DCBIOSTR2430.0[m]DCBIOSTR2450.0[m]DCBIOSTR2470.0[m]DCBIOSTR2490.0[m]DCBIOSTR2510.0[m]DCBIOSTR2530.0[m]DCBIOSTR2550.0[m]DCBIOSTR2610.0[m]DCBIOSTR2630.0[m]DCBIOSTR2650.0[m]DCBIOSTR2670.0[m]DCBIOSTR2690.0[m]DCBIOSTR2710.0[m]DCBIOSTR2730.0[m]DCBIOSTR2750.0[m]DCBIOSTR2780.0[m]DCBIOSTR2790.0[m]DCBIOSTR2800.0[m]DCBIOSTR2830.0[m]DCBIOSTR2850.0[m]DCBIOSTR2870.0[m]DCBIOSTR2890.0[m]DCBIOSTR2910.0[m]DCBIOSTR2930.0[m]DCBIOSTR2950.0[m]DCBIOSTR2970.0[m]DCBIOSTR2980.0[m]DCBIOSTR2990.0[m]DCBIOSTR3000.0[m]DCBIOSTR3010.0[m]DCBIOSTR3020.0[m]DCBIOSTR3030.0[m]DCBIOSTR3040.0[m]DCBIOSTR3050.0[m]DCBIOSTR3060.0[m]DCBIOSTR3070.0[m]DCBIOSTR3080.0[m]DCBIOSTR3090.0[m]DCBIOSTR3100.0[m]DCBIOSTR3110.0[m]DCBIOSTR3120.0[m]DCBIOSTR3130.0[m]DCBIOSTR3140.0[m]DCBIOSTR3150.0[m]DCBIOSTR3160.0[m]DCBIOSTR3170.0[m]DCBIOSTR3175.0[m]DCBIOSTR3180.0[m]DCBIOSTR3185.0[m]DCBIOSTR3190.0[m]DCBIOSTR3194.3[m]CBIOSTR3196.8[m]CBIOSTR3199.3[m]CBIOSTR3199.8[m]CBIOSTR3201.4[m]CBIOSTR3203.6[m]CBIOSTR3206.7[m]CBIOSTR3210.6[m]CBIOSTR3214.6[m]CBIOSTR3218.8[m]CBIOSTR3222.9[m]CBIOSTR3224.3[m]CBIOSTR3228.0[m]CBIOSTR3241.2[m]CBIOSTR3244.7[m]CBIOSTR3246.8[m]CBIOSTR3248.7[m]CBIOSTR3255.0[m]DCBIOSTR3265.0[m]DCBIOSTR3275.0[m]DCBIOSTR3285.0[m]DCBIOSTR3295.0[m]DCBIOSTR3305.0[m]DCBIOSTR3315.0[m]DCBIOSTR3325.0[m]DCBIOSTR3335.0[m]DCBIOSTR3345.0[m]DCBIOSTR3355.0[m]DCBIOSTR3365.0[m]DCBIOSTR3375.0[m]DCBIOSTR3385.0[m]DCBIOSTR3395.0[m]DCBIOSTR3400.0[m]DCBIOSTR3405.0[m]DCBIOSTR3410.0[m]DCBIOSTR3415.0[m]DCBIOSTR3425.0[m]DCBIOSTR3430.0[m]DCBIOSTR3435.0[m]DCBIOSTR3440.0[m]DCBIOSTR3445.0[m]DCBIOSTR3450.0[m]DCBIOSTR3455.0[m]DCBIOSTR3460.0[m]DCBIOSTR3465.0[m]DCBIOSTR3470.0[m]DCBIOSTR -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit323100211151409144514761497194519452035205522132213237531713182318231843187318732443301333734113411 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CMR PEX AIT29793421LWD - CORE ASSY31943250LWD - GR ES3842970LWD - GR RES DEN NEU SVWD00LWD - GR RES DEN NEU SVWD29703194MDT31993299MDT31993199MDT CMR31883383SONIC SCANNER OBMI18773468VSP37773860 -
Casing and leak–off tests
Casing and leak–off tests Casing typeCasing diam.
[inch]Casing depth
[m]Hole diam.
[inch]Hole depth
[m]LOT/FIT mud eqv.
[g/cm3]Formation test typeCONDUCTOR30383.036387.00.00LOTSURF.COND.201262.0261286.01.60LOTINTERM.9 5/82961.012 1/42970.01.80LOTOPEN HOLE3470.08 1/23470.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3881.6031.0Kill Fluid- SW/Bentonite3881.0423.0Spud Mud4281.6031.0Kill Fluid- SW/Bentonite10951.3918.0OBM-Low ECD12571.3917.0OBM-Low ECD12681.3037.0KCl/Polymer13121.6025.0OBM-Low ECD19361.4822.0OBM-Low ECD25761.4820.0OBM-Low ECD29701.4819.0OBM-Low ECD29721.5519.0OBM-Low ECD34281.6024.0OBM-Low ECD34711.6022.0OBM-Low ECD